1 definition
by
Dickly Bob

A buffer girl refers to a woman who you have sex with only because you need to lose your virginity and gain sexual experience for later female encounters.

Bob: Golly, I really wanna fuck Sally George, but I'm a virgin, and don't want to make a total wet rag outta myself while penetrating her.
George: Geepers bob, you should go with that buffer girl Susan, so that next time Sally asks you to put your penis in her vagina, you'll be ready.